A simple solution for single-phase shunt active power filter with improved sliding mode control

This paper presents a simple solution for the implementation of a single-phase shunt active power filter with improved sliding mode control. The operation mode of the inverter bridge is unipolar, but also bipolar, only for certain periods during the zero-passings of the line current. The sliding surface and the equivalent control are analyzed. The steady-state error is diminished by means of an improved sliding surface and theoretical assumptions are experimentally verified.